Edwin Eugene Bagley (May 29, 1857 – January 29, 1922) was an American composer, most famous for composing the march National Emblem.

Bagley was born in Craftsbury, Vermont on May 29, 1857. He began his music career at the age of nine as a vocalist and comedian with Leavitt's Bellringers, a company of entertainers that toured many of the larger cities of the United States. Bagley began playing the cornet, traveling for six years with the Swiss Bellringers. After his touring days, Bagley joined Blaisdell's Orchestra of Concord, New Hampshire.

In 1880, Bagley came to Boston as a solo cornet player at The Park Theater. For nine years, he traveled with the Bostonians, an opera company. While with this company, Bagley changed from cornet to trombone. He also performed with the Germania Band of Boston and the Boston Symphony Orchestra. In the early 1900s, Bagley played with Wheeler's Band in Bellows Falls, Vermont. Wheeler's Band was the first band to publicly perform Bagley's "National Emblem March" in 1906.

Bagley is best known for composing marches and in particular for the famous march National Emblem. This piece is played as a patriotic tune on Independence Day celebrations in the United States and features an excerpt of "The Star-Spangled Banner". It is also used by the U.S. military when presenting and retiring the colors. A theme from this march is popularly sung with the words "and the monkey wrapped his tail around the flagpole".

Bagley was married to Jannette S. Hoyt (1855–1927). His brother Ezra M. Bagley (January 3, 1853 – July 8, 1886) was first trumpet in the Boston Symphony Orchestra 1880-1884 and also composed marches for bands.

Bagley died in Keene, New Hampshire on January 29, 1922, at the age of 64. He is buried at the Greenlawn Cemetery in Keene. The Victorian Bandstand in Keene is named in Bagley's honor.